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CVE-2026-72225— jbd2: fix integer underflow in jbd2_journal_initialize_fast_commit()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 5.10版本至7.2-rc1之前版本存在安全漏洞，该漏洞源于jbd2_journal_initialize_fast_commit()函数在验证日志容量时存在整数下溢问题，当num_fc_blks超过j_last时，减法运算回绕绕过边界检查，导致日志中止。

CVSS 7.8 · High EPSS 0.18% · P7

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 6866d7b3f2bb4f011041ba54c98b1584497fe2fd< aa90f00932bf572d6ef284c977c2a60b39c13bd6 affected
6866d7b3f2bb4f011041ba54c98b1584497fe2fd< e144ad0250f77e23e28949587b8b57e40dc3b512 affected
6866d7b3f2bb4f011041ba54c98b1584497fe2fd< 4b48dcb88bb9117e3d3f051175a9a8b7cff7f8b6 affected
6866d7b3f2bb4f011041ba54c98b1584497fe2fd< fb9b49618ed7296ebfad62a3835da8945f727001 affected
6866d7b3f2bb4f011041ba54c98b1584497fe2fd< 4450dcaadf7d4aae8b6e4223b5d6ee4eb77097a9 affected
6866d7b3f2bb4f011041ba54c98b1584497fe2fd< 78955fdce8ff654e6d33a2fa90882a1e7eb26330 affected
6866d7b3f2bb4f011041ba54c98b1584497fe2fd< a58fc10adf503969fec2007b5afe8987258046c4 affected
6866d7b3f2bb4f011041ba54c98b1584497fe2fd< 289a2ca0c9b7eae74f93fc213b0b971669b8683d affected
… +10 more rows
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I. Basic Information for CVE-2026-72225

Vulnerability Information
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Vulnerability Title
jbd2: fix integer underflow in jbd2_journal_initialize_fast_commit()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: jbd2: fix integer underflow in jbd2_journal_initialize_fast_commit() jbd2_journal_initialize_fast_commit() validates journal capacity by checking (journal->j_last - num_fc_blks < JBD2_MIN_JOURNAL_BLOCKS). Both j_last and num_fc_blks are unsigned, so when num_fc_blks exceeds j_last the subtraction wraps to a large value, bypassing the bounds check. The resulting underflow corrupts j_last, j_fc_first, and j_free, leading to journal abort. Fix by checking num_fc_blks against j_last before the subtraction, returning -EFSCORRUPTED.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 5.10版本至7.2-rc1之前版本存在安全漏洞，该漏洞源于jbd2_journal_initialize_fast_commit()函数在验证日志容量时存在整数下溢问题，当num_fc_blks超过j_last时，减法运算回绕绕过边界检查，导致日志中止。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 6866d7b3f2bb4f011041ba54c98b1584497fe2fd ~ aa90f00932bf572d6ef284c977c2a60b39c13bd6 -
Linux Linux 5.10 -

II. Public POCs for CVE-2026-72225

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III. Intelligence Information for CVE-2026-72225

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Patches & Fixes for CVE-2026-72225 (8)

Same Patch Batch · Linux · 2026-08-15 · 844 CVEs total

CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-74495 9.8 CRITICAL igbvf: Fix leak in TX DMA error cleanup
CVE-2026-74394 9.8 CRITICAL RDMA/srpt: fix integer overflow in immediate data length check
CVE-2026-72417 9.8 CRITICAL netfilter: flowtable: Validate iph->ihl in nf_flow_ip4_tunnel_proto()
CVE-2026-72069 9.8 CRITICAL locking/rt: Fix the incorrect RCU protection in rt_spin_unlock()
CVE-2026-72422 9.8 CRITICAL ksmbd: fix use-after-free of conn->preauth_info in concurrent SMB2 NEGOTIATE
CVE-2026-72065 9.8 CRITICAL net: mana: Validate the packet length reported by the NIC
CVE-2026-72064 9.8 CRITICAL net: mana: Sync page pool RX frags for CPU
CVE-2026-72251 9.8 CRITICAL netfilter: nf_nat_sip: reload possible stale data pointer
CVE-2026-72249 9.8 CRITICAL netfilter: flowtable: use dst in this direction when pushing IPIP header
CVE-2026-72046 9.8 CRITICAL gve: fix header buffer corruption with header-split and HW-GRO
CVE-2026-72226 9.8 CRITICAL batman-adv: tt: prevent TVLV OOB check overflow
CVE-2026-72041 9.8 CRITICAL espintcp: use sk_msg_free_partial to fix partial send

Showing top 20 of 844 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-72225

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